Sealing type test device and method applicable to various types of oil pumps

Abstract

The invention relates to a test device and a method for various types of oil pumps, and particularly discloses a sealing type test device and a method applicable to various types of oil pumps. The test method concretely comprises the following steps of: (1) setting the step length of the initial value of the inlet pressure value Gs of the oil pumps to be tested and the gradual decrease Gs value according to the oil pump work points; (2) setting the upper and lower limit values of each step Gs through a visual interface of the monitoring software in a host computer; (3) setting the upper and lower limit values of the test media temperature T through the visual interface of the monitoring software in the host computer; (4) obtaining a net positive suction head calculation formula through deduction and simplification; and (5) gradually decreasing the Gs value according to the step length and finely regulating a throttle valve to enable the oil pump full pressure to be stabilized to the test point pressure value. The test device and the method have the advantages that the sealed space pressure regulation range is large, the pressure of the sealed space can be fast, stably and highly reliably regulated, in addition, the environment is protected, and the tested data are accurate.

Description

technical field [0001] The invention relates to a test device and method for various types of pumps, in particular to a closed test device and method suitable for various types of oil pumps Background technique [0002] When the liquid is at a certain temperature and the pressure is reduced to the vaporization pressure at the temperature, the liquid will produce bubbles, a phenomenon called cavitation. When the bubbles generated by cavitation flow to the high pressure place, their volume is reduced and even burst. Therefore, in the production of oil pumps, a test method and device are needed to conduct cavitation and performance tests on the oil pump. The accuracy of the test data directly affects the correct use and use effect of the oil pump, especially the cavitation performance has a significant impact on the service life of the oil pump. , If the NPSH data of the oil pump is inaccurate, the oil pump installation parameters designed according to the oil pump installatio...

AI Technical Summary

Problems solved by technology

When the bubbles generated during cavitation flow to the high pressure place, their volume decreases and even collapses. The extremely high frequency and impact force of the bubbles generated by cavitation and bubble rupture will cause damage to the overcurrent components of the lubricating oil pump, or even break. Therefore, in the production of oil pumps, a test method and device are needed to test the cavitation and performance of the oil pump. The accuracy of the test data directly affects the correct use and use effect of the oil pump, especially the cavitation performance has a significant impact on the service life of the oil pump. , if the NPSH data of the oil pump is inaccurate, the installation parameters of the oil pump according to its design may lead to the fracture and damage of the flow-passing parts, causing sudden lubrication and cooling interruption of lubrication points such as gears and bearings, causing heavy losses to equipment and production

[0003] At present, most production plants adopt the open-type test device of meter observation, timing, and volumetric weighing method to measure and convert the flow rate. The inlet pressure of the oil pump is realized by manually adjusting the opening of the inlet stop valve or increasing or decreasing the liquid level. The pressure adjustment range is small, the adjustment speed is slow, and the equipment is huge, etc.

The mechanical structure of the pump determines that the output pressure and flow of the pump are both pulsating, and this pulsation will also cause fluctuations in the inlet pressure of the oil pump. Neither of these two adjustment methods can adjust the inlet pressure in real time and accurately. Therefore, each oil pump There are large errors in the measured values ​​of pressure and flow, and the error of the test data obtained from this is naturally large. For example, in the cavitation test of the oil pump, the value of the inlet pressure of the oil pump must be gradually lowered step by step. It is required that the inlet pressure value set in this step is constant, and the calculation accuracy of NPSH mainly depends on the accuracy of the inlet pressure measurement value. There are many factors affecting this value, and it cannot be adjusted accurately by manual work.

In addition to the influence of external factors on the test data of the open test equipment, the medium leaked during the test will also cause great pollution to the environment

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